Unicode-Ebene
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Eine Gruppe von 65.536 aufeinanderfolgenden Unicode-Codepoints. Ebene 0 ist die Basisebene (BMP); die meisten Emoji befinden sich in Ebene 1 (SMP).
Unicode divides its 1,114,112 code points into 17 planes of 65,536 code points each (Planes 0 through 16). The first plane, Plane 0 (U+0000 to U+FFFF), is the Basic Multilingual Plane (BMP) containing most common scripts.Plane 1 (U+10000 to U+1FFFF) is the Supplementary Multilingual Plane (SMP), where most emoji are allocated. Planes 2 and beyond contain supplementary CJK characters and reserved space.
The BMP/SMP distinction matters because characters in the BMP can be represented with a single UTF-16 code unit, while SMP characters (including emoji) require surrogate pairs.